Skip to content
HotKVDocs

Ask the HotKV docs

Answers come only from these docs and can be wrong; check the linked pages before you rely on them.

NCACHE.GET

Last updated 
NCACHE.GET namespace key
Group
Keyed caches
Complexity
O(1)
Arity
3 (exactly, counting the command name)
Flags
read-only, fast
Keys
first 1, last 1, step 1
HotKV Cloud
Performance and Scale
On-Premise
requires the negative-cache license feature

The negative cache holds negative results, such as “user not found” or “refused by moderation”, usually with a short TTL, so repeated lookups for the same missing or refused item do not reach your backend or model again. NCACHE.GET returns the value stored under key, which must match byte for byte. In an existing namespace, each call counts as a hit or a miss in NCACHE.STATS. An expired entry counts as a miss.

Return value

Section titled “Return value”
Case RESP2 RESP3
Hit Bulk string: the cached value Same
Miss, expired entry, or unknown namespace Nil bulk string Null

Errors:

  • ERR wrong number of arguments for 'ncache.get' command if the argument count is wrong.
  • NOLICENSE negative-cache requires a HotKV license. Contact sales@hotkv.com if your license does not include the negative-cache feature.

Examples

Section titled “Examples”
127.0.0.1:6379> NCACHE.SET lookups "user:404" "not_found"
OK
127.0.0.1:6379> NCACHE.GET lookups "user:404"
"not_found"
127.0.0.1:6379> NCACHE.GET lookups "unknown"
(nil)

Compatibility

Section titled “Compatibility”

HotKV-only command. Redis and Valkey have no equivalent.

See also

Section titled “See also”

NCACHE.CREATE, NCACHE.SET, NCACHE.DEL, NCACHE.STATS, NCACHE.FLUSH, NCACHE.DROP, NCACHE.LIST, AI features guide